[PATCH] D147025: [InstCombine] Teach alloca replacement to handle `addrspacecast`

[Michael Liao via Phabricator via llvm-commits]

hliao created this revision.
hliao added reviewers: arsenm, yaxunl.
Herald added subscribers: hiraditya, arichardson.
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hliao requested review of this revision.
Herald added subscribers: llvm-commits, wdng.
Herald added a project: LLVM.

- As the address space cast may not be valid on a specific target, `addrspacecast` is not handled when an `alloca` is able to be replaced with the source of memcpy/memmove. This patch addresses that by querying a target hook on whether that address space cast is valid. For example, on most GPU targets, the cast from a global pointer to a generic pointer is valid.
- If that cast is allowedd (by querying `isValidAddrSpaceCast`), the replacement is enhanced to handle that `addrspacecast` as well.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147025

Files:
  llvm/include/llvm/Analysis/TargetTransformInfo.h
  llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
  llvm/include/llvm/CodeGen/BasicTTIImpl.h
  llvm/include/llvm/Transforms/InstCombine/InstCombiner.h
  llvm/lib/Analysis/TargetTransformInfo.cpp
  llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
  llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
  llvm/test/Transforms/InstCombine/ptr-replace-alloca.ll

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